Redis is an open-source, in-memory data structure store that can be used as a database, cache, and message broker. It supports a wide variety of data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries. Redis also provides various features such as transactions, pub/sub messaging system, Lua scripting support and built-in replication for high availability. Redis is widely used in web applications for caching frequently accessed data to improve performance and scalability.
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